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+++ This bug was initially created as a clone of Bug #1017649 +++
Need to add the VHD and VHDX formats tot he docs 
Need to find out how this format/ if it is supported via KVM.

Description of problem:
VHD and VHDX are 2 entirely different formats, but the qemu-img man help document appears to conflate the two. The format 'vpc' is used for VHD, and the format 'vhdx' is used for VHDX. Could you help me update it to make clear of them.

Version-Release number of selected component (if applicable):
host info:
kernel-2.6.32-422.el6.x86_64
qemu-kvm-0.12.1.2-2.412.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1.check the qemu-img man help docs that only has VHD info, no VHDX info.
# man qemu-img
...
       vpc VirtualPC compatible image format (VHD).
...
2.the QEMU has support the VHDX format disk indeed.
# /usr/libexec/qemu-kvm -drive format=?
Supported formats: raw cow qcow vdi vmdk cloop dmg bochs vpc vvfat qcow2 qed vhdx parallels nbd blkdebug host_cdrom host_floppy host_device file gluster gluster gluster gluster rbd
3.

Actual results:


Expected results:


Additional info: